What Are Ports in Networking and Types Prakash, 20, June 202320, June 2023 In the world of computer networking, ports play a crucial role in facilitating communication between devices. Whether it’s sending an email, browsing the web, or transferring files, understanding ports is essential for anyone involved in the field of networking. This article will provide a comprehensive overview of what ports are and delve into the different types of ports used in networking. TABLE OF CONTENTS1 Introduction2 What are Ports?3 Types of Ports3.1 TCP Ports3.2 UDP Ports3.3 Well-Known Ports3.4 Registered Ports3.5 Dynamic or Private Ports4 How Ports Work5 Port Numbers6 Commonly Used Ports7 Port Scanning8 Port Forwarding9 Network Security and Ports10 Conclusion11 FAQs11.1 About The Author11.1.1 Prakash11.2 RelatedIntroductionIn computer networking, ports act as communication endpoints between different devices, allowing them to send and receive data over a network. Each device participating in a network can have multiple ports, and these ports are assigned unique numbers to enable efficient and organized communication.What are Ports?A port is a logical construct within an operating system that enables network applications to establish connections and exchange data. It functions as an identifier that specifies a particular process or service running on a device. Ports are essential for distinguishing between different network services and ensuring that data reaches the intended destination.What are TCP and UDP ports? How do they work?Types of PortsTCP PortsTCP (Transmission Control Protocol) is a connection-oriented protocol that guarantees reliable and ordered data delivery. TCP ports are associated with TCP-based applications that require reliable and error-free data transmission. Examples of TCP-based services include HTTP (port 80), FTP (port 21), and SSH (port 22).UDP PortsUDP (User Datagram Protocol) is a connectionless protocol that provides fast and lightweight data transmission. Unlike TCP, UDP does not guarantee data delivery or order. UDP ports are associated with applications that prioritize speed over reliability. Such as DNS (port 53), DHCP (port 67), and TFTP (port 69).Well-Known PortsWell-known ports, also known as system ports, are predefined ports ranging from 0 to 1023. These ports are reserved for commonly used services and protocols. For instance, port 80 is reserved for HTTP, port 443 for HTTPS, and port 25 for SMTP (Simple Mail Transfer Protocol).Registered PortsRegistered ports range from 1024 to 49151 and are assigned by the Internet Assigned Numbers Authority (IANA) to specific services or applications. These ports are typically used by lesser-known or customized applications. Examples include port 3306 for MySQL and port 5432 for PostgreSQL.Dynamic or Private PortsDynamic or private ports range from 49152 to 65535. These ports are not assigned to any specific application or service and are commonly used for ephemeral connections. When a device initiates a connection, it can use a dynamic port as its source port.How Ports WorkWhen data is sent from one device to another, it is encapsulated in packets. Each packet contains both the IP address and the port number of the source and destination devices. This information helps routers and switches route the packets correctly, ensuring they reach the appropriate application or service running on the destination device.Port NumbersPort Number Service name Transport protocolDescription7EchoTCP, UDPEcho service20FTP-data TCP, SCTPFile Transfer Protocol data transfer21FTP TCP, UDP, SCTPFile Transfer Protocol (FTP) control connection22SSH-SCPTCP, UDP, SCTP Secure Shell, secure logins, file transfers (scp, sftp), and port forwarding23TelnetTCPTelnet protocol—unencrypted text communications25SMTPTCP Simple Mail Transfer Protocol, used for email routing between mail servers53DNSTCP, UDP Domain Name System name resolver69TFTPUDPTrivial File Transfer Protocol80HTTPTCP, UDP, SCTPHypertext Transfer Protocol (HTTP) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP88KerberosTCP, UDPNetwork authentication system102Iso-tsapTCPISO Transport Service Access Point (TSAP) Class 0 protocol110POP3TCPPost Office Protocol, version 3 (POP3)135Microsoft EPMAPTCP, UDPMicrosoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service, used to remotely manage services including DHCP server, DNS server, and WINS. Also used by DCOM137NetBIOS-nsTCP, UDP NetBIOS Name Service, used for name registration and resolution139NetBIOS-ssnTCP, UDPNetBIOS Session Service143IMAP4TCP, UDP Internet Message Access Protocol (IMAP), management of electronic mail messages on a server381HP OpenviewTCP, UDPHP data alarm manager383HP OpenviewTCP, UDPHP performance data collector.443HTTP over SSLTCP, UDP, SCTPHypertext Transfer Protocol Secure (HTTPS) uses TCP in versions 1.x and 2. HTTP/3 uses QUIC, a transport protocol on top of UDP.464KerberosTCP, UDPKerberos Change/Set password465SMTP over TLS/SSL, SSMTCPAuthenticated SMTP over TLS/SSL (SMTPS), URL Rendezvous Directory for SSM (Cisco protocol)587SMTPTCPEmail message submission593Microsoft DCOMTCP, UDPHTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server636LDAP over TLS/SSLTCP, UDPLightweight Directory Access Protocol over TLS/SSL691MS ExchangeTCPMS Exchange Routing902VMware ServerunofficialVMware ESXi989FTP over SSLTCP, UDPFTPS Protocol (data), FTP over TLS/SSL990FTP over SSLTCP, UDP FTPS Protocol (control), FTP over TLS/SSL993IMAP4 over SSLTCPInternet Message Access Protocol over TLS/SSL (IMAPS)995POP3 over SSLTCP, UDPPost Office Protocol 3 over TLS/SSL1025Microsoft RPCTCPMicrosoft operating systems tend to allocate one or more unsuspected, publicly exposed services (probably DCOM, but who knows) among the first handful of ports immediately above the end of the service port range (1024+).1194OpenVPNTCP, UDPOpenVPN1337WASTEunofficialWASTE Encrypted File Sharing Program1589Cisco VQPTCP, UDPCisco VLAN Query Protocol (VQP)1725SteamUDPValve Steam Client uses port 1725 2082cPanelunofficialcPanel default2083radsec, cPanelTCP, UDP Secure RADIUS Service (radsec), cPanel default SSL2483Oracle DBTCP, UDPOracle database listening for insecure client connections to the listener, replaces port 15212484Oracle DBTCP, UDPOracle database listening for SSL client connections to the listener2967Symantec AVTCP, UDPSymantec System Center agent (SSC-AGENT)3074XBOX LiveTCP, UDPXbox LIVE and Games for Windows – Live3306MySQLTCP MySQL database system3724World of WarcraftTCP, UDPSome Blizzard games, Unofficial Club Penguin Disney online game for kids4664Google DesktopunofficialGoogle Desktop Search5432PostgreSQLTCPPostgreSQL database system5900RFB/VNC ServerTCP, UDPvirtual Network Computing (VNC) Remote Frame Buffer RFB protocol6665-6669IRCTCPInternet Relay Chat .6881BitTorrentunofficialBitTorrent is part of the full range of ports used most often6999BitTorrentunofficialBitTorrent is part of the full range of ports used most often6970QuicktimeunofficialQuickTime Streaming Server8086Kaspersky AVTCPKaspersky AV Control Center8087Kaspersky AVUDPKaspersky AV Control Center8222VMware ServerTCP, UDPVMware Server Management User Interface (insecure Web interface).9100PDLTCPPDL Data Stream, used for printing to certain network printers.10000BackupExecunofficialWebmin, Web-based Unix/Linux system administration tool (default port)12345NetBusunofficialNetBus remote administration tool (often Trojan horse).27374Sub7unofficialSub7 default31337Back OrificeunofficialBack Orifice 2000 remote administration toolsPort numbers are 16-bit unsigned integers, allowing a maximum of 65,535 unique ports. These numbers are divided into three ranges: well-known ports, registered ports, and dynamic or private ports. By using port numbers, devices can establish communication by specifying the appropriate port numbers for the source and destination.Commonly Used PortsCertain ports are commonly used by popular applications and services. Understanding these ports can help identify network traffic and troubleshoot issues. Some examples include:Port 80: Used for HTTP trafficPort 443: Used for HTTPS trafficPort 25: Used for SMTP trafficPort 21: Used for FTP trafficPort 22: Used for SSH trafficPort ScanningPort scanning is the process of actively probing a device or network to discover open ports. It helps identify potential vulnerabilities and security weaknesses. However, it’s important to note that port scanning without proper authorization is considered unethical and may be illegal.Port ForwardingPort forwarding, also known as port mapping, is a technique used to redirect incoming network traffic from one port to another. It is commonly used to enable remote access to devices behind a router or firewall. Port forwarding allows specific ports on the external IP address to be forwarded to internal IP addresses and ports.Network Security and PortsUnderstanding ports is crucial for network security. Open ports can serve as potential entry points for unauthorized access or attacks. It is important to monitor and manage open ports, ensuring that only necessary ports are accessible and that proper security measures are in place to protect against potential threats.ConclusionPorts are an integral part of networking that enable devices to communicate and exchange data. TCP and UDP ports serve different purposes, and well-known, registered, and dynamic ports provide flexibility in assigning port numbers. Understanding ports, their types, and their role in networking is essential for effective network management and security.FAQsWhat is the difference between TCP and UDP ports?TCP ports are associated with connection-oriented protocols that provide reliable data delivery, while UDP ports are associated with connectionless protocols that prioritize speed over reliability.How are port numbers assigned?Port numbers are assigned by various entities, including the Internet Assigned Numbers Authority (IANA) for well-known and registered ports. Dynamic or private ports are not assigned to any specific application.Can I change the port number of an application?In some cases, it is possible to change the port number of an application. However, it may require modifying the application’s settings or configuration files.Why is port scanning considered unethical?Port scanning without proper authorization is considered unethical because it involves probing a network or device for potential vulnerabilities without permission, which can be a security risk.How can I secure open ports on my network?Securing open ports involves implementing proper network security measures such as firewalls, access control lists, and intrusion detection systems. Regular monitoring and patching of systems are also important.About The Author Prakash See author's posts Related Reveals Tech Cyber SecurityWhat Are Ports in Networking
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